I was wondering this on Facebook, which is where UnovaRPG said this, and in the comments section everyone was saying UnovaRPG had lied... And nobody could find it. UnovaRPG hasn't replied since, so (to the best of my knowledge) no-one knows.

I don't think they even released Mothim. If it was released, at least one person in the comments would had said where Mothim was and some people said they searched everywhere and couldn't find it. I wouldn't be surprised if the UnovaRPG staff were just lazy and didn't even bother adding Mothim.